These entries are queried from radb.net using whois, you can try my project getting these.
:AS136248 route: 103.84.252.0/22 descr: Fast Net BD origin: AS136248 mnt-by: MAINT-FASTNETBD-BD last-modified: 2021-08-17T09:18:16Z country: BD source: APNIC rpki-ov-state: valid route: 103.84.252.0/23 descr: Fast Net BD origin: AS136248 mnt-by: MAINT-FASTNETBD-BD last-modified: 2021-08-17T09:17:49Z country: BD source: APNIC rpki-ov-state: valid route: 103.84.252.0/24 descr: Fast Net BD origin: AS136248 mnt-by: MAINT-FASTNETBD-BD last-modified: 2021-08-17T09:17:23Z country: BD source: APNIC rpki-ov-state: valid route: 103.84.253.0/24 descr: Fast Net BD origin: AS136248 mnt-by: MAINT-FASTNETBD-BD last-modified: 2021-08-17T09:16:56Z country: BD source: APNIC rpki-ov-state: valid route: 103.84.254.0/23 descr: Fast Net BD origin: AS136248 mnt-by: MAINT-FASTNETBD-BD last-modified: 2021-08-17T09:16:30Z country: BD source: APNIC rpki-ov-state: valid route: 103.84.254.0/24 descr: Fast Net BD origin: AS136248 mnt-by: MAINT-FASTNETBD-BD last-modified: 2021-08-17T09:16:02Z country: BD source: APNIC rpki-ov-state: valid route: 103.84.255.0/24 descr: Fast Net BD origin: AS136248 mnt-by: MAINT-FASTNETBD-BD last-modified: 2021-08-17T09:15:36Z country: BD source: APNIC rpki-ov-state: valid route6: 2400:a540::/32 origin: AS136248 descr: Abdur Rahim Bishas Plot No-89,Sayed Grand Center,Room No-774. Sector-7,Uttara. mnt-by: MAINT-FASTNETBD-BD last-modified: 2022-10-02T05:38:40Z source: APNIC rpki-ov-state: valid